Deceiver = Occultist
Mage Hunter = Nightblade
Purifier = Arcanist
Ritualist = Necromancer? (you said we met both already, and this is the only sub group, that and this is the perfect way to give us a cold/vit spec)
Sentinel = Shaman
Tactician = Soldier
Vindicator = Demolitionist

I'm litearally shaking here, guys! I never felt so hyped before! Holy crap... and it's almost exactly how I thought the Inquisitor mastery was going to be! I think i need to relax a bit after seeing this...